Can uncertainties in sea ice albedo reconcile patterns of data-model discord for the Pliocene and 20th/21st centuries? HOWELL ET AL.
Can uncertainties in sea ice albedo reconcile patterns of data-model discord for the Pliocene and 20th/21st centuries? HOWELL ET AL.
复制标题
海冰反照率的不确定性能否调和上新世和 20 世纪/21 世纪数据模型不一致的模式？
DOI：
10.1002/2013gl058872
复制
发表时间：
2014
影响因子：
5.2
通讯作者：
Howell F
中科院分区：
文献类型：
--
作者：
Howell F
上新世中期暖期的大气环流模型模拟(3.264至3.025年前)目前低估了代理数据所表明的高纬度地区存在的变暖程度，估计的海表面温度偏差高达11摄氏度，地表气温估计的偏差高达17摄氏度。海冰对高纬度气候有很强的影响，部分原因是反照率反馈。我们展示了在mPWP的大气环流模式模拟中最小海冰反照率限制减少的影响。在北极观测到的年平均地表气温升高高达6℃，而模式数据误差的最大降幅仅为0.81℃。年平均海表面温度升高高达2℃，模式数据最大误差改善1.31℃。
General Circulation Model simulations of the mid‐Pliocene warm period (mPWP, 3.264 to 3.025 Myr ago) currently underestimate the level of warming that proxy data suggest existed at high latitudes, with discrepancies of up to 11°C for sea surface temperature estimates and 17°C for surface air temperature estimates. Sea ice has a strong influence on high‐latitude climates, partly due to the albedo feedback. We present results demonstrating the effects of reductions in minimum sea ice albedo limits in general circulation model simulations of the mPWP. While mean annual surface air temperature increases of up to 6°C are observed in the Arctic, the maximum decrease in model‐data discrepancies is just 0.81°C. Mean annual sea surface temperatures increase by up to 2°C, with a maximum model‐data discrepancy improvement of 1.31°C. It is also suggested that the simulation of observed 21st century sea ice decline could be influenced by the adjustment of the sea ice albedo parameterization.